Welcome to Baker Coupling LLC Winner of the Steel Pipe Event of the Year Award for 1990 Baker Provides the Following Items Proudly Made in the USA: Sleeve Type Coupling up to and Above 30 ft (9.1 meters) Diameter Includes Transition and Reducing Couplings and Expansion Joints Flanged Coupling Adaptors Dismantling Joints Baker Expansion Joints Segmented Coupling R.H. Baker and Company was founded over 100 years ago, and incorporated in 1939.